Min Ryou
,
Chul-Hyun Kim
,
Myung-Ho Kim
材料科学技术（英）
Microstructure and mechanical properties of hyper-eutectic Al-Si alloy fabricated by spray casting were investigated and then these results were compared with those by squeeze cast. The spray-cast specimen was found to have finer Si particles (～5 μm) compared to the squeeze-cast specimen (10–25 μm). The tensile strength and elongation of the spray-cast specimen are also higher than those of the squeeze cast one. It was considered that the increased mechanical properties of the spray-cast specimen were mainly due to finer size of the Si particles distributed in Al matrix.
关键词:
Hyper-eutectic Al-Si alloy
,
null
,
null
Min Ryou
,
Byoung-Soo Lee
,
Myung-Ho Kim
材料科学技术（英）
The influence of aging treatment on the microstructure, mechanical properties and electrical conductivity of Cu-0.5 wt pct Be alloy for connector material applications was investigated. The properties of mechanical strength and electrical conductivity increase with increasing aging temperature and time. Microstructure of the aged Cu-Be alloy revealed that grain size and fraction of low angle and high angle grain boundary were not greatly changed; however, transmission electron microscopy (TEM) analysis exhibited that beryllides precipitation (CoBe and NiBe) with a size of 50 nm were distributed in grains. It was, therefore concluded that these beryllide precipitates improved the mechanical strength and also it was favor in improvement of electrical conductivity.
关键词:
Cu-Be alloy
,
null
,
null
